Markerboard



FIG. 1 is a front isometric view of the markerboard;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a back elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a front isometric view of a second embodiment of the markerboard;

FIG. 9 is a front elevation view thereof;

FIG. 10 is a back elevation view thereof;

FIG. 11 is a right side elevation view thereof;

FIG. 12 is a left side elevation view thereof;

FIG. 13 is a top plan view thereof;

FIG. 14 is a bottom plan view thereof;

FIG. 15 is a front isometric view of a third embodiment of the markerboard;

FIG. 16 is a front elevation view thereof;

FIG. 17 is a back elevation view thereof;

FIG. 18 is a right side elevation view thereof;

FIG. 19 is a left side elevation view thereof;

FIG. 20 is a top plan view thereof; and,

FIG. 21 is a bottom plan view thereof.

The broken lines shown in the drawing views are included for purposes of illustrating environment and form no part of the claimed design. 

CLAIM The ornamental design of a markerboard, as shown and described. 